/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraHierarchyViewModelBase.h
Overriding this will give the details panel instance customizations for specific UClasses.
virtual [TArray](API\Runtime\Core\Containers\TArray)< [TTuple](API\Runtime\Core\Misc\TTuple)< [UClass](API\Runtime\CoreUObject\UObject\UClass) *, FOnGetDetailCustomizationInstance > > GetInstanceCustomizations()